The Thea Sisters are thrilled about the new performing arts programme being offered at Mouseford Academy. That is, until they meet the head of the department - the demanding and strict Professor Ratyshnikov. The mouselets will have to audition just to get into her class! On top of that, the famouse ballerina is an old friend of Headmaster de Mousus, but the two no longer get along. It's up to the Thea Sisters to find out why